| Duck River Electric Membership Corporation |
Project 25 Phase I |
Shelbyville |
| General Motors (USA) |
DMR Motorola Connect Plus (TRBO) |
Various |
| General Motors Saturn |
EDACS Standard |
Spring Hill |
| Middle Tennessee Regional Trunked Radio System |
Project 25 Phase II |
Multiple |
| Middle Tennessee Two-Way (Columbia) |
LTR Standard |
Columbia |
| Ryder Integrated Logisitics |
LTR Standard |
Spring Hill |
| Tennessee Advanced Communications Network (TACN) |
Project 25 Phase II |
Various |
| Tennessee BrandMeister Network |
DMR Conventional Networked |
Various |
